linux/vt_buffer.h: allow either builtin or modular for macros

Fix build errors on ARCH=alpha when CONFIG_MDA_CONSOLE=m.
This allows the ARCH macros to be the only ones defined.

In file included from ../drivers/video/console/mdacon.c:37:
../arch/alpha/include/asm/vga.h:17:40: error: expected identifier or '(' before 'volatile'
17 | static inline void scr_writew(u16 val, volatile u16 *addr)
| ^~~~~~~~
../include/linux/vt_buffer.h:24:34: note: in definition of macro 'scr_writew'
24 | #define scr_writew(val, addr) (*(addr) = (val))
| ^~~~
../include/linux/vt_buffer.h:24:40: error: expected ')' before '=' token
24 | #define scr_writew(val, addr) (*(addr) = (val))
| ^
../arch/alpha/include/asm/vga.h:17:20: note: in expansion of macro 'scr_writew'
17 | static inline void scr_writew(u16 val, volatile u16 *addr)
| ^~~~~~~~~~
../arch/alpha/include/asm/vga.h:25:29: error: expected identifier or '(' before 'volatile'
25 | static inline u16 scr_readw(volatile const u16 *addr)
| ^~~~~~~~

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Randy Dunlap <[e-mail]>
Cc: Greg Kroah-Hartman <[e-mail]>
Cc: Jiri Slaby <[e-mail]>
Cc: [e-mail]
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

include/linux/vt_buffer.h

···
 
 #include <linux/string.h>
 
-#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_MDA_CONSOLE)
+#if IS_ENABLED(CONFIG_VGA_CONSOLE) || IS_ENABLED(CONFIG_MDA_CONSOLE)
 #include <asm/vga.h>
 #endif